High-magnetism high-mechanical-strength bonded neodymium iron boron (NdFeB) permanent magnet and preparation method thereof
A technology with mechanical strength and high magnetic properties, applied in the fields of magnetic objects, inductance/transformer/magnet manufacturing, magnetic materials, etc., can solve the problems of poor magnetism, poor mechanical strength, and high loss of grinding and molding, and achieve strong magnetism and service life of the magnet. Long, productive results
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Embodiment 1
[0032] A bonded NdFeB permanent magnet with high magnetic properties and high mechanical strength comprises NdFeB magnetic powder, thermosetting resin, curing agent and lubricant, and the magnetic powder contains metallocene polymer ferromagnetic powder and stainless steel powder. High magnetic and high mechanical strength bonded NdFeB permanent magnet composition: 1000g of quick-quenched NdFeB magnetic powder with a mass ratio of less than 100 mesh and 100-200 mesh with a mass ratio of 1:0.45, 100g of 325 mesh stainless steel powder, and metallocene polymer ferromagnetic powder (OPM) 180g, epoxy resin 46g, dicyandiamide curing agent 2.2g, zinc stearate 6g.
Embodiment 2
[0034] A method for preparing a bonded NdFeB permanent magnet with high magnetic properties and high mechanical strength, comprising the following steps:
[0035] (1) Mix thermosetting epoxy resin, curing agent and acetone 1-4 times the mass of thermosetting epoxy resin evenly;
[0036] (2) Use a mixer to mix NdFeB magnetic powder, metallocene polymer ferromagnetic powder with a mass of 7-23% of NdFeB magnetic powder and stainless steel powder with a mass of NdFeB magnetic powder of 3-17%;
[0037] (3) Add the mixture of step (2) to the mixture of step (1), and mix evenly with a mixer;
[0038] (4) Bake the obtained mixture at 80°C for 5-9 hours, the dried powder is sieved by a vibrating sieving machine, and finally a lubricant is added and mixed evenly to obtain the magnetic powder mixture of the present invention;
[0039] (5) The magnetic powder mixture is compressed into various shapes of magnet green bodies through a compression molding machine; the pressure of the compr...
Embodiment 3
[0042] Preparation of high magnetic and high mechanical strength bonded NdFeB permanent magnet: 1000g of quick-quenched NdFeB magnetic powder with a ratio of 1:0.45 between mesh number less than 100 mesh and 100 mesh to 200 mesh, 50g of 325 mesh stainless steel powder, and metallocene Polymer ferromagnetic powder (OPM) 150g, epoxy resin 36g, dicyandiamide curing agent 1.8g, zinc stearate 5g. Mix epoxy resin, dicyandiamide curing agent and acetone 1-4 times the weight of the resin evenly, then add the mixture of magnetic powder, metallocene polymer ferromagnetic powder (OPM) and stainless steel powder, and use a mixer to mix The above magnetic powder mixture and resin are fully stirred and mixed evenly. Then, the obtained mixture is baked at 80°C for 5-9 hours, the dried powder is sieved by a vibrating sieving machine, and finally a certain proportion of zinc stearate is added and mixed evenly to obtain the magnetic powder mixture of the present invention , The magnetic powder...
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